104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/* @(#) Shifts the four quadrants of a fourier transform for display
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* @(#) Any number of bands, any coding, any band format
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* @(#) Works on images with even sizes
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* @(#) Output is the same as the input
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* @(#)
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* @(#) Usage:
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* @(#)
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* @(#) int
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* @(#) im_rotquad( in, out )
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* @(#) IMAGE *in, *out;
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* @(#)
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*
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* Copyright: 1990, N. Dessipris.
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*
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* Author: Nicos Dessipris
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* Written on: 12/04/1990
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* Modified on : 09/05/1991
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* Modified on : 09/06/1992, J.Cupitt.
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* - now works for any type, any number of bands.
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* - uses bcopy instead of a loop: mucho faster.
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* now uses memcpy - for Sys5 compat K.Martinez 29/4/92
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* 5/8/93 JC
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* - some ANSIfication
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* 28/6/95 JC
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* - some more modernisation
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* 11/7/02 JC
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* - redone in term of extract()/insert(), for great partialisation
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* 14/4/04
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* - sets Xoffset / Yoffset
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <vips/vips.h>
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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int
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im_rotquad( IMAGE *in, IMAGE *out )
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{
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IMAGE *t[6];
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int xd = in->Xsize / 2;
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int yd = in->Ysize / 2;
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if( in->Xsize < 2 || in->Ysize < 2 )
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return( im_copy( in, out ) );
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if( im_open_local_array( out, t, 6, "im_rotquad-1", "p" ) ||
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/* Extract 4 areas.
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*/
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im_extract_area( in, t[0], 0, 0, xd, yd ) ||
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im_extract_area( in, t[1], xd, 0, in->Xsize - xd, yd ) ||
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im_extract_area( in, t[2], 0, yd, xd, in->Ysize - yd ) ||
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im_extract_area( in, t[3], xd, yd,
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in->Xsize - xd, in->Ysize - yd ) ||
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/* Reassemble, rotated.
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*/
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im_insert( t[3], t[2], t[4], in->Xsize - xd, 0 ) ||
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im_insert( t[1], t[0], t[5], in->Xsize - xd, 0 ) ||
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im_insert( t[4], t[5], out, 0, in->Ysize - yd ) )
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return( -1 );
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out->Xoffset = xd;
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out->Yoffset = yd;
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return( 0 );
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}
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